CBSE Class 7 - SA2 English Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 7 - SA2 English Sample Question Paper (2016-17)

CBSE Class 10 - Marking Scheme of SA2 Social Science Sample Question Paper (2016-17)

CBSE Class 10  - Marking Scheme of SA2 Social Science Sample Question Paper (2016-17)

See Class 10 SA2 Social Science SQP (2016-17)

CBSE Class 10 - SA2 Social Science Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 10  - SA2 Social Science Sample Question Paper (2016-17)

See Marking Scheme of SA2 Social Science SQP (2016-17)

CBSE Class 8 - Sanskrit (संस्कृत) SA2 Sample Question Paper (2016-17)(#cbsepapers)

CBSE Class 8 - Sanskrit (संस्कृत) SA2 Sample Question Paper (2016-17)

CBSE Class 8 - Maths - Squares - Properties of A Perfect Square (#cbsenotes)

Properties of A Perfect Square

Please look at the table of some squares given below. You will see interesting patterns here.

Square of number 0 = 0

Number	Square	Number	Square	Number	Square
1	1	11	121	21	441
2	4	12	144	22	484
3	9	13	169	23	529
4	16	14	196	24	576
5	25	15	225	25	625
6	36	16	256	26	676
7	49	17	289	27	729
8	64	18	324	28	784
9	81	19	361	29	841
10	100	20	400	30	900

PROPERTY 1:
Look at the table above. Observe that none of the column of squares ends with 2, 3, 7, or 8. Therefore we can say that a number endings with 2, 3, 7, 8 can never be a perfect square.
Thus 228257 , 132457 , 189678 , 84453 are not perfect squares.

PROPERTY 2:
Look at the last row of the table shown above. We notice that all the perfect squares are ending with an even number or 0. In the first line  e.g. 10² = 100 , 20² = 400, 30² =900,
Similarly 80²  = 6400, 50² = 2500.

We can prime factorise and see that 10, 20, 30,  etc . are not perfect squares. Thus a number ending with odd  number of zeros can never be a perfect square.

CBSE Class 8 - English SA2 Sample Question Paper (2016-17)

CBSE Class 8 - English SA2 Sample Question Paper (2016-17)

CBSE Class 12 - Biology Marking Scheme Of Sample Question Paper (2016-17) (#cbsenotes)

CBSE Class 12 - Biology Marking Scheme Of Sample Question Paper (2016-17)

☛See Biology Sample Question Paper (2016-17)